They'll hear you at the far ends of the field when you use the 40W thousand-foot megaphone. Easy to hold, easy to carry, it has more than enough range. The microphone is built into the rear end of the unit and is activated by a trigger control. Be heard up to 800 feet away with this super-powerful, 40 watts megaphone. This megaphone includes a 10 second integrated audio memory for voice playback. Amplify your voice cord-free and with clarity with this lightweight device. Unit includes adjustable volume control, built-in siren, and wrist strap for added safty. Requires 4 D batteries (not included).